modify sin led gpio

hc

2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e

 kernel/samples/bpf/spintest_user.c
..
..
@@ -1,52 +1,99 @@
1
1
 // SPDX-License-Identifier: GPL-2.0
2
2
 #include <stdio.h>
3
3
 #include <unistd.h>
4
-#include <linux/bpf.h>
5
4
 #include <string.h>
6
5
 #include <assert.h>
7
6
 #include <sys/resource.h>
8
-#include "libbpf.h"
9
-#include "bpf_load.h"
7
+#include <bpf/libbpf.h>
8
+#include <bpf/bpf.h>
10
9
 #include "trace_helpers.h"
11
10
 
12
11
 int main(int ac, char **argv)
13
12
 {
14
13
 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
14
+	char filename[256], symbol[256];
15
+	struct bpf_object *obj = NULL;
16
+	struct bpf_link *links[20];
15
17
 	long key, next_key, value;
16
-	char filename[256];
18
+	struct bpf_program *prog;
19
+	int map_fd, i, j = 0;
20
+	const char *section;
17
21
 	struct ksym *sym;
18
-	int i;
19
22
 
20
-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
21
-	setrlimit(RLIMIT_MEMLOCK, &r);
23
+	if (setrlimit(RLIMIT_MEMLOCK, &r)) {
24
+		perror("setrlimit(RLIMIT_MEMLOCK)");
25
+		return 1;
26
+	}
22
27
 
23
28
 	if (load_kallsyms()) {
24
29
 		printf("failed to process /proc/kallsyms\n");
25
30
 		return 2;
26
31
 	}
27
32
 
28
-	if (load_bpf_file(filename)) {
29
-		printf("%s", bpf_log_buf);
30
-		return 1;
33
+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
34
+	obj = bpf_object__open_file(filename, NULL);
35
+	if (libbpf_get_error(obj)) {
36
+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
37
+		obj = NULL;
38
+		goto cleanup;
39
+	}
40
+
41
+	/* load BPF program */
42
+	if (bpf_object__load(obj)) {
43
+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
44
+		goto cleanup;
45
+	}
46
+
47
+	map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
48
+	if (map_fd < 0) {
49
+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
50
+		goto cleanup;
51
+	}
52
+
53
+	bpf_object__for_each_program(prog, obj) {
54
+		section = bpf_program__section_name(prog);
55
+		if (sscanf(section, "kprobe/%s", symbol) != 1)
56
+			continue;
57
+
58
+		/* Attach prog only when symbol exists */
59
+		if (ksym_get_addr(symbol)) {
60
+			links[j] = bpf_program__attach(prog);
61
+			if (libbpf_get_error(links[j])) {
62
+				fprintf(stderr, "bpf_program__attach failed\n");
63
+				links[j] = NULL;
64
+				goto cleanup;
65
+			}
66
+			j++;
67
+		}
31
68
 	}
32
69
 
33
70
 	for (i = 0; i < 5; i++) {
34
71
 		key = 0;
35
72
 		printf("kprobing funcs:");
36
-		while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) {
37
-			bpf_map_lookup_elem(map_fd[0], &next_key, &value);
73
+		while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
74
+			bpf_map_lookup_elem(map_fd, &next_key, &value);
38
75
 			assert(next_key == value);
39
76
 			sym = ksym_search(value);
40
-			printf(" %s", sym->name);
41
77
 			key = next_key;
78
+			if (!sym) {
79
+				printf("ksym not found. Is kallsyms loaded?\n");
80
+				continue;
81
+			}
82
+
83
+			printf(" %s", sym->name);
42
84
 		}
43
85
 		if (key)
44
86
 			printf("\n");
45
87
 		key = 0;
46
-		while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0)
47
-			bpf_map_delete_elem(map_fd[0], &next_key);
88
+		while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0)
89
+			bpf_map_delete_elem(map_fd, &next_key);
48
90
 		sleep(1);
49
91
 	}
50
92
 
93
+cleanup:
94
+	for (j--; j >= 0; j--)
95
+		bpf_link__destroy(links[j]);
96
+
97
+	bpf_object__close(obj);
51
98
 	return 0;
52
99
 }